Vehicle and trading bugfixes (#51)

* Sanity checks + Starting level changes

- Item movement handler checks to make sure items aren't moved from equipment slot to equipment slot.
- Item give command checks to make sure an out of bounds item is not spawned (Below iType 0 or above iType 8)
- Players now begin at level 36, consequently the item give command does not level you up now.

* Initial Trade Implementation

* Sanity Check

- Prevents out of bounds item movement by comparing it to AINVEN_COUNT.

* Taros and Trading

* Update ItemManager.cpp

* Update ItemManager.cpp

* working trading system

* Trading system code pointerified

- It works with the recent pointer changes needed.

* Vehicles and Trading bugfixes

src/CNShardServer.cpp

@@ -32,7 +32,7 @@ void CNShardServer::keepAliveTimer(CNServer* serv,  uint64_t currTime) {
     auto cachedPlayers = PlayerManager::players;
 
     for (auto pair : cachedPlayers) {
-        if (pair.second.lastHeartbeat != 0 && currTime - pair.second.lastHeartbeat > 4000) { // if the client hadn't responded in 4 seconds, its a dead connection so throw it out
+        if (pair.second.lastHeartbeat != 0 && currTime - pair.second.lastHeartbeat > 60000) { // if the client hadn't responded in 60 seconds, its a dead connection so throw it out
             pair.first->kill();
             continue;
         }